Patchwork [1/3] UBI: block: Fix block device size setting

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Submitter Ezequiel Garcia
Date Aug. 29, 2014, 9:42 p.m.
Message ID <1409348550-27768-2-git-send-email-ezequiel.garcia@free-electrons.com>
Download mbox | patch
Permalink /patch/384396/
State New
Headers show

Comments

Ezequiel Garcia - Aug. 29, 2014, 9:42 p.m.
We are currently taking the block device size from the ubi_volume_info.size
field. However, this is not the amount of data in the volume, but the
number of reserved physical eraseblocks, and hence leads to an incorrect
representation of the volume.

In particular, this produces I/O errors on static volumes as the block
interface may attempt to read unmapped PEBs:

$ cat /dev/ubiblock0_0 > /dev/null
UBI error: ubiblock_read_to_buf: ubiblock0_0 ubi_read error -22
end_request: I/O error, dev ubiblock0_0, sector 9536
Buffer I/O error on device ubiblock0_0, logical block 2384
[snip]

Fix this by using the ubi_volume_info.used_bytes field which is set to the
actual number of data bytes for both static and dynamic volumes.

While here, improve the error message to be less stupid and more useful:
UBI error: ubiblock_read_to_buf: ubiblock0_1 ubi_read error -9 on LEB=0, off=15872, len=512

It's worth noticing that the 512-byte sector representation of the volume
is only correct if the volume size is multiple of 512-bytes. This is true for
virtually any NAND device, given eraseblocks and pages are 512-byte multiple
and hence so is the LEB size.

Fixes: 9d54c8a33eec ("UBI: R/O block driver on top of UBI volumes")
Signed-off-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
---
 drivers/mtd/ubi/block.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)
Artem Bityutskiy - Sept. 8, 2014, 10:52 a.m.
On Fri, 2014-08-29 at 18:42 -0300, Ezequiel Garcia wrote:
> We are currently taking the block device size from the ubi_volume_info.size
> field. However, this is not the amount of data in the volume, but the
> number of reserved physical eraseblocks, and hence leads to an incorrect
> representation of the volume.
> 
> In particular, this produces I/O errors on static volumes as the block
> interface may attempt to read unmapped PEBs:
> 
> $ cat /dev/ubiblock0_0 > /dev/null
> UBI error: ubiblock_read_to_buf: ubiblock0_0 ubi_read error -22
> end_request: I/O error, dev ubiblock0_0, sector 9536
> Buffer I/O error on device ubiblock0_0, logical block 2384
> [snip]
> 
> Fix this by using the ubi_volume_info.used_bytes field which is set to the
> actual number of data bytes for both static and dynamic volumes.
> 
> While here, improve the error message to be less stupid and more useful:
> UBI error: ubiblock_read_to_buf: ubiblock0_1 ubi_read error -9 on LEB=0, off=15872, len=512
> 
> It's worth noticing that the 512-byte sector representation of the volume
> is only correct if the volume size is multiple of 512-bytes. This is true for
> virtually any NAND device, given eraseblocks and pages are 512-byte multiple
> and hence so is the LEB size.
> 
> Fixes: 9d54c8a33eec ("UBI: R/O block driver on top of UBI volumes")
> Signed-off-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>

Looks good, do we want this one in stable?

Patch

diff --git a/drivers/mtd/ubi/block.c b/drivers/mtd/ubi/block.c
index 33c6495..a29d41c 100644
--- a/drivers/mtd/ubi/block.c
+++ b/drivers/mtd/ubi/block.c
@@ -188,8 +188,8 @@  static int ubiblock_read_to_buf(struct ubiblock *dev, char *buffer,
 
 	ret = ubi_read(dev->desc, leb, buffer, offset, len);
 	if (ret) {
-		ubi_err("%s ubi_read error %d",
-			dev->gd->disk_name, ret);
+		ubi_err("%s ubi_read error %d on LEB=%d, off=%d, len=%d",
+			dev->gd->disk_name, ret, leb, offset, len);
 		return ret;
 	}
 	return 0;
@@ -378,7 +378,7 @@  int ubiblock_create(struct ubi_volume_info *vi)
 {
 	struct ubiblock *dev;
 	struct gendisk *gd;
-	u64 disk_capacity = ((u64)vi->size * vi->usable_leb_size) >> 9;
+	u64 disk_capacity = vi->used_bytes >> 9;
 	int ret;
 
 	if ((sector_t)disk_capacity != disk_capacity)
@@ -502,7 +502,7 @@  int ubiblock_remove(struct ubi_volume_info *vi)
 static int ubiblock_resize(struct ubi_volume_info *vi)
 {
 	struct ubiblock *dev;
-	u64 disk_capacity = ((u64)vi->size * vi->usable_leb_size) >> 9;
+	u64 disk_capacity = vi->used_bytes >> 9;
 
 	if ((sector_t)disk_capacity != disk_capacity) {
 		ubi_warn("%s: the volume is too big, cannot resize (%d LEBs)",
@@ -523,7 +523,7 @@  static int ubiblock_resize(struct ubi_volume_info *vi)
 
 	mutex_lock(&dev->dev_mutex);
 	set_capacity(dev->gd, disk_capacity);
-	ubi_msg("%s resized to %d LEBs", dev->gd->disk_name, vi->size);
+	ubi_msg("%s resized to %lld bytes", dev->gd->disk_name, vi->used_bytes);
 	mutex_unlock(&dev->dev_mutex);
 	mutex_unlock(&devices_mutex);
 	return 0;